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为研究含粗颗粒滑带土流变性质对水库滑坡的影响,基于谭家湾滑坡的勘察成果和监测数据,分析了滑坡的变形特征;选取含粗颗粒滑带土原状试样开展三轴流变试验,研究了滑带土的变形及其强度。结果表明,含粗颗粒滑带土呈现瞬时弹塑性变形、衰减变形和稳态变形3个阶段,与滑坡宏观变形阶段具有较好的一致性;在荷载稳定阶段滑带土变形分为衰减变形和稳态变形,其变形趋势亦与水位稳定时滑坡宏观变形演化相吻合;含粗颗粒滑带土为典型的稳定流变材料,其变形阶段与不含粗颗粒滑带土相近,且含粗颗粒滑带土的强度参数具有显著时间效应,会对滑坡的长期稳定性产生不利影响。研究结果为滑坡变形预测及长期稳定性评价奠定了基础。
In order to study the influence of rheological properties of coarse-grained slide zone on reservoir landslide, the deformation characteristics of landslide are analyzed based on the survey results and monitoring data of Tanjiawan landslide. Three-axial flow Change the test, studied the deformation and strength of slip-soil. The results show that the coarse-grained slide-zone soil exhibits three stages of instantaneous elastoplastic deformation, attenuation deformation and steady deformation, which are in good agreement with the macro-deformation stages of the landslide. In the stage of load stabilization, the deformation of the landslide soil is divided into attenuation deformation and Steady deformation, the trend of deformation consistent with the macroscopic deformation evolution of landslide when the water level is stable. The coarse-grained slide-zone soil is a typical stable rheological material whose deformation stage is similar to that of the coarse-grained slide zone soil, The strength parameters of sliding zone soil have significant time effect, which will adversely affect the long-term stability of landslide. The research results provide the basis for landslide deformation prediction and long-term stability evaluation.